Questions For practise from Force

# Important Questions for SLC Examination
Define gravitation.
Why the moon does not moves farther from earth although it is moving round the earth  ?
Which force doesn’t let the earth go outside its orbit ?
State reason; large mass of water go up when the moon or the sun comes over the sea.
Larger tide is produced when the moon comes over the sea than the sun do so. What does it justify ?
State law of gravitation.
What relation is there in between gravitation and distance between two masses ?
What types of relation is there between gravitation and magnitude of masses ?
What is change in gravitational force in between two bodies if
Mass of one of them is halved ?
The mass of both of them is doubled ?
The distance between them is doubled ?
Derive    F =
What is G ? Why is it called universal ?
What is unit of G ? Justify it.
How much gravitational force is produced between two masses 1 kg each are kept at a distance of 1 meter ?
Define gravity.
What change in gravitational force if the earth is pushed towards the sun ?
Why don't we feel gravitation between two bodies separated by some distance ?
Define weight of a body.
Mass of mountain is 3x1010 kg. A man with mass of 100 kg is standing 100m from the centre of the mountain. Find gravitational force between the man and mountain.
Find amount of mass that should be kept at distance of one metre from one kg of mass to exert 1 Newton of gravitational force.
What will be weight of 5 kg of rock on the surface of Jupiter ? Mass and radius of Jupiter are 1.9 x 1027 kg and 7.1 x 107 m respectively.
Define
Gravitational field
Intensity of gravitational field
Derive the formula to calculate intensity of gravitation. What does the intensity of gravitation depend on ? Find the unit of intensity of gravitational field ?
If the intensity of gravitational field is x unit at the surface of earth. What will be its value at the point at the height that equals to length of radius of the earth ?
Intensity of gravitational field is 9.8 N/kg. If the earth contracts till its radius becomes  where R is radius of earth at present, what will be new value of intensity of gravitation ?
If a star stops to burn, state probable change in gravitational field intensity at its surface ? Justify with reason.
Mass and radius of earth are M and R. And mass and radius of Jupiter are 318x and 11y. How many times is the gravitational field intensity of Jupiter as compared to that of the earth ?
Where will the weight of unit mass be more out of bottom and tip of a mountain ? Given reasons to justify your answer.
List the effect of gravity with 4 examples of each, which are favorable and unfavorable to our daily activities.
Define the term acceleration due to gravity.
What is the gravity effect of ? Explain.
Are accelerations due to gravity of small stone and big stone
equal ? Give reasons.
There is gravitation at force between an apple hanging from a tree and the earth. Why doesn't the earth go toward the apple ?
What does the Newton’s experiment on a guinea and feather prove ?
Do a stone and feather fall at equal rate if both are let to fall at once ? What will be result of such experiment if it is held in moon ? Explain with reasons.
Derive) g =
State relations of g with mass and radius of a massive body separately.
What is meant by g = 9.8 m/s2 ?
Why is value of g less at top of mountain than at its bottom ?
Why is value of g less in moon than in earth ?
Distinguish between g and G.
Prove : g  ...
What does the acceleration due to gravity depend on ?
Find the mass that could be lifted in moon, by a person who can lift 2000N of weight in the earth.
Why is it easier to lunch a rocket in moon than to do so in the
earth ?
Differentiate between g and E, E= Intensity of gravitational field.
Define the term free fall.
What is the difference between falling of stone and paratrooper from a plane ?
A paratrooper lands safely in the earth although he jumps from very high land will he safely if he falls from very height on the moon ? Give reasons.
Why does water not come down through the hole at the bottom of cup while the cup filled with water is falling freely ?
Why does a person feel no notion to trade elevator while elevator falls freely ?
Define weightlessness.
State reason for a body is weightless while it is falling freely.
State three conditions in which a body is weightless.
Define null points.
Can water be poured from one vessel to another, in null points ? Explain with reasons.
Distinguish the weightlessness of a body in a space from the weightlessness in free fall of a body.